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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 10-17-2007
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to lean?

says bank 1&2 are lean i just changed the o2 sensors front and back ...
what else can it be? My next guess would be mass air flow.any help would be appreciated.I do know that in the morning when i turn the truck on,the truck runs a little rough at start up then runs fine after a few seconds
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Old 10-17-2007
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ttt
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Old 10-17-2007
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it may be a bad cat also.
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Old 10-17-2007
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vaccum leak
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Old 10-17-2007
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how would go about checking if one of those are the problem?
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Old 10-17-2007
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Check and make sure all you vacuum hoses are going somewhere and look for cracked or broken hoses. Or listen for a leak.
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Old 11-28-2007
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My dads 99 4.0 OHV was doing the same thing. I tried all the normal stuff but what fixed it was replacing the "plenum" gaskets. The rubber inserts that go into the plastic upper intake looked like they had flattened out over time and was letting unmetered air into the intake.
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